Single-trigger mechanism for double-barrel firearms



Dec. 4, 1928.

C. W. LINDSAY SINGLE TRIGGER MECHANISM FOR DOIiBLE BARREL FIREARMS Filed July is INVEN TOR.

Patented Dec. 4, 1928.;

' tion; of myinvention which has for its r o ject viz,

I SINGLE-TRIGGER ivrncnnnislvr Feeeoee em eenrmmms. I 1

V I Ap plic ation filed' my 18, following is a'full and exact descrip 1. Topr0v1de a singlet'rigg'er mechanism of fewest parts possible; which'issimple 1n operation, sure inaction 21I1l$ttbl8i1llfld justment. f be "2. To provide a'single trigger mechanism of this character whereby the two barrels may be fired in affixed order of succession or by means of a sear-lift-Jsli'de," onebarreh alone may be fired repeatedly while the other barrel remains inactive. Q

' 3. T0 provide a single trigger-mechanism. of said character in which, after the initial barrel has beenfire'd, the second barrel is effectively prevented from prematurely firing, incident to the rebound and involuna; tary-trigger pull; g

.4. To provide a single trigger'rnechamsin of said character which'is suspended bya pivot-from the upper tang of the main 'frameand' thereby is net influenced iniits' adjustment or operation by a defective stock, T loose or maladjusted trigger plate. 5, To provide a single trigger mechanism ofsaidchfaracter which is-actuated bySa hammer-sear acting upon a pivotedgmovabl'e in p'osition tofire 'the rightbarrel.' Fig. 2

leverv I .6: To provlde'a slngle trigger mechanism of said character, actuated bya hammer scar and regulated in its selective sear setting" operation by an opposing controller' spring, 7. To provide a single trigger mechanism of saidcharacterwhich is set :ZEOIj dPQI'HJtlQl'I by a hammer sear, and" also released from this position, through the TGSPQCtlYGl'CQCkr ing' and releasing of the hammers.

These objects are attained by a'mechanism composed-of the followin parts; viz, 1, a carrierbar, 2, a sear-1i t, 3, a' se'ar-1ift setter, 4, a controller-spring}? jandf5; a, sear-lift-slide with' its 6,, fh.0ldingspring. @These parts are hereinafter more; fully described and are illustrated by the. accompanying .drawingsinwhicha Fig. 1' is a. erspect vevlew ofithe main frame with barrels an'distock removed and; r I p 7 p p 'at lO nea'r t-s middle. to the carrier-bar 7.5;

showing, in dotted lines, the hammers in; cocked position and the triggerimechanism is a perspective view of the two hammer sears with the trigger mechanism in the 'act of releasing the'right s'ear The-leftQsear' is, not disturbed as its rear, end projection Passes h t r l, n hthe sea? .bly; Fig. 9 is a side elevation of-the-sear-f lift-slide.

-- in a groove mule under side of the'upperi tang ;5-,- with a pivot -e,;u1reugh 'itsJ-up'per -end',the carrier-bar 7, is suspenderh'so that lift-setter- 11, and th ri htghainme sea a lift flrsflll latter is inovedupwardby theiver" tical plate of the trigger; Fig.53.,is5aQsi1n5 ilar view to ,Fig. 2' after trigger. has-been 7 released, showing the sear-lift; moved tofl its V 7; most forward position witha shoulderiun- H dernea'thf the left 'hammer searpr'eparatory; 1 to releasingthe left hammerfandshowingiw fired a'asithej right,hammerfsear 'is}, aga'in* if 'freefo'fthe sear -lift. 'Fig. 5 is' a detailed 71 r view ofthe carrier-bar. Fig. 6 is a -detailed"; View {of the'sea liftf Fig.- 7 is a-ijdetailed; T View of-thesear-liftsettier. v Figg'fi is a de-Q tailed view; of the co11tro'ller-'sp ring assem:v 75

Referring more specifically Qto the: drawingswherein similar'numerals'referzto the 1 same parts throughout the several .fViBW S l,=des'ignates the frame of the usual double barrel firearm which houses the fi'ri'ngmech anismf In theside's of frame 1,.are pivoted h 2 the hammer holding sears v2, 2. At 'the posterior ends of the sears 2; 2, are lateral 4; ca1led-thesear lift andshownfin Eiggjfi.

it has considerable backward and forward V V motion which isnecessary 1n theioperation --of the inechanismif Theflower 'endi'ofithez; 5 Y I i carrier-bar "Z is pivoted-by a pin,8,iinto" the 9 5 bifurcated posterior 1 end" 9,? of the sear-lift j 4-. "Near-themiddle ofthe carrier-barf7fis pivoted by a *pin 10, 1 the sear-lift-setterll,

ig.E7)'... From the anterior edge off the carrier b'ar 7, is 1a projecti0n 12, whichhasits "10b,

tip turnedi outward and over the pathof the. sear-lift-setter 111 so as "to" steadyit" f check excessive 'upward movement. 1 The sear lift-setter l1,- 'is fiat andpijotedf i=5 I 1 At itsjposterior end there projection '13; bearinga verticalhole 18?, throu'gh:

which the lower end: f: th 'ont' q fl fr spr -is a i ipin l (Fig. 8). p j ct's-ardf'operates; in maintainingfclose working gco tact between .the.;anteri0rend of the jisea 3, will be engaged bythe seer-lift same "time this frees shifting-the action oi -the trigger 20, 21 0'111 the first to the second. hammer sear, which in turn will be; fired When the triggenis' the lefthammer seeris not a'iiected by'this ,movement. VVhen'the reer-end oit:the-right sear was being raised itslirteral projection hammer sears 2.92, asqthe 3. This anterior end is sloping on both its upper and lower front corners so" esto form a: bluntpoint or nose l4:, W11l.Ci1, through the exertion of the controller-spring, is'kep't'in' contact With-the leterel projection 3, of the right hammer sear 2. (it could be'fadjus't ed to the leit hammer seer instead 177 v "The sear-lift 4;, is slightly curved from trontto rear ie-nd has abifureat'ed posterior endi9, into which the lower reiid of the car-'7 'rierr-"berqiis pivoted at'S; 'On onelateral edgeris' anotch or'indent l5, and opposite onfthe other lateral, edge is a 'projection of [The spiral "controller-spring 1L7, 18)

encircles-and is attached at its upper'end' toenraxiahpin 18. This pin, is pivoted et jupper end 19, to the rmder side ofth'eupper V tang 5, posterior to the pivot 6, ofthe car- 'rier-Vberfl The lower end-ofthis axial-pin protrudes through the vertie hole 133 in theprogeetmn on the posterior en l of the sear-hit-setter 11. This controller- 'spring'cessembly exerts a continuous forceto the front, tending to push forte-rd the entire trigger mechanism and thereby rinsintaining elose vWorking contact between the pushes forward the carrier-bar 7., with its sear-lift s, so that the secondhaini iei seer th'e'first se thereby again pulled. 0 j

ll lounted upon and extending ough the trigger plate '21, is the 'seer-lift slide 22,, Fig.9) provided on theunder side of the trigger plate 21; 'with if shi'i ting' thumb piece 23, As the sear-lift-slide 22,-is moved backward by the thumb piece 23,it-' causes a Yertreal post 24,, to mpinge against "adetent 25, one the'sear-lift 4i, thereby compressing the controller-spring}17," and u ovil lg the entire Vmechenisrn backward so tor that the. lug 16,011 the seer-h tti L'lSolZlCQtl behindfthe ri 'ht seerpro'ectlon 3, thus ieeving the r ght. hammersearfree;

The location 8' on the ofth'e seer-lift 4-. V opposite-or left hammer seer will new .con-

tinuously engage the shoulden'of the'seerlift, in front otthe-'indent l5 ,l thus peri inittingltheleftberrelfoniy to befired. re-

moved forward the 1 impinge agqmst the lug; 16, of the sear-lift peatedl'jfi As'fthe th V ertic'eliv post. Qt, will the to its original position, Thefierticzil bar 26, is, an integral part of the seer-lift-slide "22, 1ar1-d contains ec ur-ved slot 27, into which projectsv one end; of a holding-spring 28, that serves to hold the slide in either of its two possible positions.

The operation" ofthe stentiellyes' follows; Whenever the haunmers ere; coeked," by i Whatever means accord-V ing to the make of firezirn1,1tl1e anterior mechanism is sub- 4:,,thus imoving the entire mechanism back ends of the hammer-sears 2, 2, are pushed downw rd by the han mersQthereby elevats osterlor end-$3,723, 01": the scars. As

the'posterior end of the right, or chosen seer comes gup it mpinges; egslnst the under slop ng surface of theenterior end of the seajr -lii t setterill, forcing it backward until only ;the nose or; point. 14, makes contact with this hammer see-r. 'As the sear-lift setter isgthus being forced backward by the hammer seer 3, ,it{ carries backward with it the WVllQlQ mechanism including the: cerrierbzrr 7, a'nd :also eoinpresses v the controller spring 17.

1 Upon}; pulling-"the trigger, f its the triggerrplate 21," will" impinge against As the carrier-bar is thus forced backward; Ill-P111153 withjlt the rsear hft 4, and thelatter is brought into such-a, positronvm a V g V I l vertichi blade that extends upward through" a slot n the under side of the sear lift 4, thereby aising it, which fin-turn byineens" of its lug '16, Villraise the rear end 3, of the right hammer seer until it releases that'henimer;

Since theprojection3, on the left heminer sear is over the indent 15, in the sear-lift 4,

3,fmov ed over :th e" nose or tip l ifto the Thislis the position 5 Byreleasing the trigger, its .verti oziljbliide,

,the sear lift' 4:, right searfi, (Willall descend. to a position of rest; Initsdescent theleterslgprojection 3, 'o the right (or rhosen) sear will pass from the 'uppei" slopng' jsurfece over thefnose or tlp 1%, to the under sloping "surface anterior end ofthe sesr-littssetter 11, thus:zillowing the Wholetrigger liiechahism to be pushed forard" by the eompressed, controller-spring 17. theJcerrier-ber flfgoes' forward-it pushes the Iseair-lift 45; forward -unt il' the 1 lshouldefjust behindthe indent 15, engages the lateral "projectio'ri 3',."on the rear end of upper sloping surfiiee'ofthe'anterior end of Q. th $eer'- :S tt ;l v of parts when. right berrelis firedes shown Eig; 2. i

left sear, and the lug 16, passes in front of the lateral projectionfi; on the rear end of" right sear, leavingthe-rightsear'free .The

. descend to a positionof rest, thuscomplet parts are now in position tofirethesecond' or left barrel as shown by Fig. 3. V v 1 When the trigger is again pulledthe sear lift 4, is raised as before but on account of its new position,,the left sear only is now raised until it releases the left' hammer; Since the' right sear. is free of'tl1e'- lug l6,

y tical blade,.sear-lift 4, and left sear. 3, will ing the cycle of movements incident to-cocking and firing both'hammers in a-fixe dorder of succession. 1

If"t is desired to fire thele ft barrel only or repeatedly',-the 'sear lift-slide 22, is pulled backward by the thumb piece 23, which will pull the entire trigger mechanism backward, until the right hammer sear nolo'ngermake's contact with the sear-lift 4, and thus remains inactive, But the left hammer sear; makes continuous contact with a shoulder of the sear-lift4, just in front of'the indent 15',

and is raised to release the left cocked ham mereach time the trigger is'pulled as shown in Fig. 4. 4 p Y 1 When the right or firstbarrelis fired the sear-lift-setter 1 1,- is held firmly between able through the force ofthe controller spring 17 to push the sear-lift 4- forward into position to release the leftror second hammen. During the recoilthe.carrierdoar I p t I I V 1 p -biLI 1Bl-fil82LIfIIlS,.1I1 comb nat on-with hammer; n

7,; and its attached parts- 4 andfll are held in-this fixedposition, first by the uu o the'trigger and second by the inertia'of As the recoil ends and rest of these parts. H the rebound begins the ca'rrier-barj'i', and its attached parts 4 and 1 1, are pulled backward by the inertia'of-motion which these parts attained duringthe recoil, and which is great enough to overcome the constant forward acting force of the controller spring 17, thereby again preventing thesear-l lift-setter 11, fromgetting theseardift 4,

' in position to release the second hammer.

During this rebound as the trigger forcibly makes contact with the finger so as to cause; an involuntary triggerpull, the. right' hamf mer sear 3, will again be raised as during the original voluntary trigger-pull, since" up to this time the sear-lift-setter"11,-has not suc-;

ceeded in getting the sear-lift 4, moved from LettersfBatentisz t y I i 1..A; single trigger mechanism for double V.

to the fsear-lift-setter thereby maintaining: l

.of the carrier-bar and-its avoided, substantiallyas described. V

firing -fof the second barrel has been 'eifec. tivelyavoided. 7 7 ,1; .s V It "is. totibe understood that fvarious changes-may be employed and; modifications"? I ofstructure made, "such aschanging the l order offiring, or selection of hammerlsearfla tol gactuate the trigger; mechanism,without.

departing from thespiritof the invention. What: claim andfwish to secure byf.

barrel' firearins, in combination withharnmer" sears and p a common" sear actuatlngf means,

a;;carrier;bansuspendedjon apivot from the r V tang oft thermain frame and-carrymg' a sears. 7

11a we sear-lift-setter-back and 1 forth in 55. their selective action upon the hammer sears. 5

2..gA singl'e trigger mechanismfordoublef i firearms, incombination with l an nierfinl.v sears agcomnionsearactuating means and a earner-bar, a controller .s'pring spiraled around: axial P that i Pivotedat its' m upper endto the upper ltang,'behinjd the c'ariierbar, and connected at its lower end,

close working "Contact between the mecha;-' 95, 71-1 .nism Qandthehammer sears, substantiallyasdescribedi 1 single trigger mechanism for double? the risejand fall oftheposte'rior end ofthe- I selectedactuating 'hammer .searwagainst the i:

said sloping surface willgovern thepos'ition' assembly, substantiallyasdescribed;1

4 ."A single triggerme chanisin for double 7' barrel firearms, in combination with hammerv no 1 sears and a. connnonsearf actuating meansj];

-a "carriembar; and controller-spring each pivoted' i -the'.top tang.landlinutually adjusted inf weight and -tension wherebypr'e mature iiring' of the second barrel) is 5 

